body {
    font-family: Arial, sans-serif;
}

header,
footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 10px 0;
}

nav {
    background-color: #333;
    color: white;
    padding: 10px;
}

main {
    margin: 15px;
}

section {
    margin-bottom: 15px;
}